Malicious PDF — malware analysis report

Static analysis result for SHA-256 67612dde83271a4e…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 11:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ded7551e88fa3870b17f5a77562e1d08 SHA-1: 503c0cb4012bec67213a544394085863d850c7a5 SHA-256: 67612dde83271a4e27cc526b55f1cfee0dd1db9a2bd9eb44039c74cbb2229105
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://baovephuongtroi.com/vietkiendo/upload/file/lutotajefexomafolesupu.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2911019d52---bofeveje.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1bb7aa6f21fec679bd81545391ebe57f/19409550964.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2783e946b---70022125721.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af61df5f0---morubumuto.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b71605c9a---81921434590.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16088a97ddb27e---lutomi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090b54fd7d69---86525960178.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/44567136800.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160960fb72c204---83516311466.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5078a0bb62331bb9a1ebbc7172954a65/79067103804.pdfIn PDF document text
    • https://inncredel.com/uploads/xawixomiz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f8d603b99d994809f9656b3902cadf89/dedabifi.pdfIn PDF document text
    • http://klpa.net/userData/board/file/98913374635.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/691bc620be48714ebb437a795500e605/juxaponajukipegitiz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d53af2a3e---96694841978.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/kijifiduboxowow.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/332trh7sfn1aesghhv55d6r80k/rasowumixor.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/9002939291.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947677f0b5f---pomofojapugilawifad.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/gufewowumipemeriwuk.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a682deafe57e0ec119b129ff820c4756/30554815990.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160888579dbd11---75061776218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=check+a+port+is+open+windowsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 25248 bytes
SHA-256: 4d8403e87b65ee6da7118187bc634503e399eea3b5f27e5ca9d6284d3f218981
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 10772 bytes
SHA-256: c7ce5c6c220573eecf93055ed9fb965de0c4f1843ac9cf0ec964abb314038bf2

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